AYON: 3rd party addon usage (#5300)

* implemented helper functions to get ffmpeg and oiio tool arguments

* modified validation functions to be able to handle list of arguments

* path getters can return a path in AYON mode if one argument is returned

* removed test exception

* modified docstrings

* is_oiio_supported is using new functions to get launch arguments

* new functions are in lib public =

* use new functions all over the place

* renamed 'ffmpeg_path' to 'ffmpeg_args'

* raise 'ToolNotFoundError' if tool argument could not be found

* reraise 'KnownPublishError' in publish plugins

* fix comment

* simplify args start

* ffmpeg and oiio function require tool name and support additional arguments

* renamed 'get_oiio_tools_args' to 'get_oiio_tool_args'

* fix variable name

openpype/hosts/harmony/plugins/publish/extract_render.py

@@ -94,15 +94,14 @@ class ExtractRender(pyblish.api.InstancePlugin):
 
         # Generate thumbnail.
         thumbnail_path = os.path.join(path, "thumbnail.png")
-        ffmpeg_path = openpype.lib.get_ffmpeg_tool_path("ffmpeg")
-        args = [
-            ffmpeg_path,
+        args = openpype.lib.get_ffmpeg_tool_args(
+            "ffmpeg",
             "-y",
             "-i", os.path.join(path, list(collections[0])[0]),
             "-vf", "scale=300:-1",
             "-vframes", "1",
             thumbnail_path
-        ]
+        )
         process = subprocess.Popen(
             args,
             stdout=subprocess.PIPE,